Sulaiman, S., A. Aris, A. R. Abdul Syukor, and K. Muda. “The Effect of Static Mixer For Aerobic Biogranules Formation For Textile Industry Wastewater Treatment”. Journal of Engineering and Technology (JET), vol. 9, no. 1, June 2018, pp. 89-98, https://jet.utem.edu.my/jet/article/view/1569.